Hello!
I’m beginner in Django. I do Django Tutorial from Mozilla.
I get TemplateDoesNotExist at /catalog/books/ . Please, help me. I don’t understand how to resolve it.
/catalog/urls
from django.urls import path
from . import views
urlpatterns = [
path('', views.index, name='index'),
path('books/', views.BookListView.as_view(), name='books'),
path('book/<int:pk>', views.BookDetailView.as_view(), name='book-detail'),
]
catalog/models
# Used to generate URLs by reversing the URL patterns
from django.urls import reverse
from django.db import models
from django.urls import reverse
import uuid
# Create your models here.
class Genre(models.Model):
"""Model representing a book genre (e.g. Science Fiction, Non Fiction)."""
name = models.CharField(
max_length=200,
help_text="Enter a book genre (e.g. Science Fiction, French Poetry etc.)"
)
def __str__(self):
"""String for representing the Model object (in Admin site etc.)"""
return self.name
class Book(models.Model):
"""Model representing a book (but not a specific copy of a book)."""
title = models.CharField(max_length=200)
author = models.ForeignKey('Author', on_delete=models.SET_NULL, null=True)
# Foreign Key used because book can only have one author, but authors can have multiple books
# Author as a string rather than object because it hasn't been declared yet in file.
summary = models.TextField(
max_length=1000, help_text="Enter a brief description of the book")
isbn = models.CharField('ISBN', max_length=13,
unique=True,
help_text='13 Character <a href="https://www.isbn-international.org/content/what-isbn'
'">ISBN number</a>')
genre = models.ManyToManyField(
Genre, help_text="Select a genre for this book")
# ManyToManyField used because a genre can contain many books and a Book can cover many genres.
# Genre class has already been defined so we can specify the object above.
language = models.ForeignKey(
'Language', on_delete=models.SET_NULL, null=True)
class Meta:
ordering = ['title', 'author']
def display_genre(self):
"""Creates a string for the Genre. This is required to display genre in Admin."""
return ', '.join([genre.name for genre in self.genre.all()[:3]])
display_genre.short_description = 'Genre'
def get_absolute_url(self):
"""Returns the url to access a particular book instance."""
return reverse('book-detail', args=[str(self.id)])
def __str__(self):
"""String for representing the Model object."""
return self.title
class Language(models.Model):
name = models.CharField(
max_length=50, help_text="Enter the book's natural language (e.g. English, French, Japanese etc.)")
def __str__(self):
return self.name
class BookInstance(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4,
help_text="Unique ID for this particular book across whole library")
book = models.ForeignKey('Book', on_delete=models.SET_NULL, null=True)
imprint = models.CharField(max_length=200)
due_back = models.DateField(null=True, blank=True)
LOAN_STATUS = (
('m', 'Maintenance'),
('o', 'On loan'),
('a', 'Available'),
('r', 'Reserved'),
)
status = models.CharField(max_length=1, choices=LOAN_STATUS,
blank=True, default='m', help_text='Book availability')
class Meta:
ordering = ["due_back"]
def __str__(self):
"""
String for representing the Model object
"""
return '%s (%s)' % (self.id, self.book.title)
class Author(models.Model):
"""
Model representing an author.
"""
first_name = models.CharField(max_length=100)
last_name = models.CharField(max_length=100)
date_of_birth = models.DateField(null=True, blank=True)
date_of_death = models.DateField('Died', null=True, blank=True)
def get_absolute_url(self):
"""
Returns the url to access a particular author instance.
"""
return reverse('author-detail', args=[str(self.id)])
def __str__(self):
"""
String for representing the Model object.
"""
return '%s, %s' % (self.last_name, self.first_name)
catalog/views
from django.views import generic
from django.shortcuts import render
# Create your views here.
from .models import Book, Author, BookInstance, Genre
def index(request):
"""View function for home page of site."""
# Generate counts of some of the main objects
num_books = Book.objects.all().count()
num_instances = BookInstance.objects.all().count()
# Available books (status = 'a')
num_instances_available = BookInstance.objects.filter(
status__exact='a').count()
# The 'all()' is implied by default.
num_authors = Author.objects.count()
context = {
'num_books': num_books,
'num_instances': num_instances,
'num_instances_available': num_instances_available,
'num_authors': num_authors,
}
# Render the HTML template index.html with the data in the context variable
return render(request, 'catalog/index.html', context=context)
class BookListView(generic.ListView):
"""Generic class-based view for a list of books."""
model = Book
paginate_by = 10
class BookDetailView(generic.DetailView):
"""Generic class-based detail view for a book."""
model = Book
locallirary/urls
"""locallibrary URL Configuration
The `urlpatterns` list routes URLs to views. For more information please see:
https://docs.djangoproject.com/en/3.1/topics/http/urls/
Examples:
Function views
1. Add an import: from my_app import views
2. Add a URL to urlpatterns: path('', views.home, name='home')
Class-based views
1. Add an import: from other_app.views import Home
2. Add a URL to urlpatterns: path('', Home.as_view(), name='home')
Including another URLconf
1. Import the include() function: from django.urls import include, path
2. Add a URL to urlpatterns: path('blog/', include('blog.urls'))
"""
from django.views.generic import RedirectView
from django.conf.urls.static import static
from django.conf import settings
from django.urls import path
from django.contrib import admin
# Use include() to add URLS from the catalog application and authentication system
from django.urls import include
urlpatterns = [
path('admin/', admin.site.urls),
]
urlpatterns += [
path('catalog/', include('catalog.urls')),
]
# Use static() to add url mapping to serve static files during development (only)
urlpatterns += static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)
# Add URL maps to redirect the base URL to our application
urlpatterns += [
path('', RedirectView.as_view(url='/catalog/', permanent=True)),
]
# Add Django site authentication urls (for login, logout, password management)
urlpatterns += [
path('accounts/', include('django.contrib.auth.urls')),
]
locallibrary/settings.py
"""
Django settings for locallibrary project.
Generated by 'django-admin startproject' using Django 3.2.7.
For more information on this file, see
https://docs.djangoproject.com/en/3.2/topics/settings/
For the full list of settings and their values, see
https://docs.djangoproject.com/en/3.2/ref/settings/
"""
import os
from pathlib import Path
# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent
# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/3.2/howto/deployment/checklist/
# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'django-insecure-k6nhe44hm-a90^cs6**sre$8ajn7u!e735ou4c(1iqk-ga&g!9'
# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = os.environ.get('DJANGO_DEBUG', '') != 'False'
ALLOWED_HOSTS = []
# Application definition
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'catalog.apps.CatalogConfig',
]
MIDDLEWARE = [
'django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
]
ROOT_URLCONF = 'locallibrary.urls'
TEMPLATES = [
{
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': [os.path.join(BASE_DIR, 'templates')],
'APP_DIRS': True,
'OPTIONS': {
'context_processors': [
'django.template.context_processors.debug',
'django.template.context_processors.request',
'django.contrib.auth.context_processors.auth',
'django.contrib.messages.context_processors.messages',
],
},
},
]
WSGI_APPLICATION = 'locallibrary.wsgi.application'
# Database
# https://docs.djangoproject.com/en/3.2/ref/settings/#databases
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': BASE_DIR / 'db.sqlite3',
}
}
# Password validation
# https://docs.djangoproject.com/en/3.2/ref/settings/#auth-password-validators
AUTH_PASSWORD_VALIDATORS = [
{
'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
},
]
# Internationalization
# https://docs.djangoproject.com/en/3.2/topics/i18n/
LANGUAGE_CODE = 'en-us'
TIME_ZONE = 'Europe/London'
USE_I18N = True
USE_L10N = True
USE_TZ = True
# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/3.2/howto/static-files/
STATIC_URL = '/static/'
# Default primary key field type
# https://docs.djangoproject.com/en/3.2/ref/settings/#default-auto-field
DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
Path templates
locallibrary
-----catalog
------ templates
------ base_generis.html
-------book_detail.html
----------catalog
----------book_list.html
----------index.html
book_list.html
{% extends "base_generic.html" %}
{% block content %}
<h1>Book List</h1>
{% if book_list %}
<ul>
{% for book in book_list %}
<li>
<a href="{{ book.get_absolute_url }}">{{ book.title }}</a> ({{book.author}})
</li>
{% endfor %}
</ul>
{% else %}
<p>There are no books in the library.</p>
{% endif %}
{% endblock %}
index.html
{% extends "base_generic.html" %}
{% block title %}
<title>Стартовая страница</title>
{% endblock %}
{% block content %}
<h1>Local Library Home</h1>
<p>Welcome to <em>LocalLibrary</em>, a very basic Django website developed as a tutorial example on the Mozilla
Developer Network.</p>
<h2>Dynamic content</h2>
<p>The library has the following record counts:</p>
<ul>
<li><strong>Books:</strong> {{ num_books }}</li>
<li><strong>Copies:</strong> {{ num_instances }}</li>
<li><strong>Copies available:</strong> {{ num_instances_available }}</li>
<li><strong>Authors:</strong> {{ num_authors }}</li>
</ul>
{% endblock %}
